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How do you change the coefficient of friction betweentwo surfaces?

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Depends on whether you want to increase, avoid changes, or decrease friction (for large objects) or stiction (microsystems). Keep in mind that friction and chaffing from sliding materials together almost always changes the subsequent coefficient of friction.

Rough surfaces sliding over each other causes chaffing and the peaks get scraped off and the valley's filled in with the chaffing. This may increase or decrease the coefficient with subsequent use.

Lubricants as they dry often act like glue.

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Electrostatic forces can be reduced by introducing a conductive compound in the lubricant.

Certain ceramic beads (looks like a powder) can be charged electrically to actively change the coefficient of friction.

Brake pad and clutch materials can be used for changing the coefficient of friction as a function of applied pressure.

Often the coeffiecient is a function of a great many factors the summation of probability of occurrence multiplied by level of impact, provide active control with predictable value over a wide range of variables.

This can be implemented with a Result Management Matrix ( and this is the practical form of predicting the future. A management scenario that ensures an outcome.

This is also the basis of what we call matter, when in terms of quantum entanglements.

See "Probability Aliasing"
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You can use lubricants, you can sand and polish the surfaces, depends really on what surfaces they are and what they use for.

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